I think I'll also have to go with the majority here; Jericho winning the EC seems the most logical thing right now. Besides, we've had Edge vs Taker at WM before, and even though Edge got involved with Sheamus on RAW recently, I don't see him going to WM against Sheamus. Sheamus vs Edge just doesn't really mean anything (mostly because Sheamus by himself doesn't yet "mean" that much); given the circumstances, the only match that would really matter involving Sheamus and the WWE title at WM would be Sheamus vs John Cena, since it was Cena that Sheamus took the belt from. But I'm really curious to see as to how the RAW chamber plays out as well, and whether they really decide to keep the belt on Sheamus going into WM - simply because Sheamus just has next to no name value yet, and him being in the main event of Wrestle f'n Mania does seem a little out of place; WM is just THE biggest event of the year that needs to put the focus on the top stars - and Sheamus isn't a top star by a long shot, obviously.
Of course it could be quite an upset if Sheamus retains, but this could also lead up to a possible triple threat constellation for the WWE title... but right now, I just don't see any real worthwile feud for the WWE title except for Cena/Sheamus. Which of course won't happen if they have to go with Batista/Vince vs Bret/Cena... but I digress.
As far as the SD Chamber is concerned now, as stated I think Jericho would be the best option, mostly because Edge vs Jericho for the title at WM could be a pretty damn good match, has a storyline that is already more than well set up, and is also a match we haven't had in such a high profile situation at Wrestlemania before, as opposed to other constellations we might get - especially if Taker retains, and Taker headlining WM with a title is always a bit problematic, as due to the streak, he probably will not lose anyway, especially if the title challenger is just "someone" who has more or less randomly earned his shot, instead of someone who could be a real threat to the streak by himself and has a reason to feud with Taker (i.e. HBK).
So giving the belt to Jericho could be a pretty good decision, and would leave the possibility open for Taker vs HBK II. Besides, given that Taker is in obvious pain, and given that he would most likely retain at WM if he was champion going in, he would need to keep the belt at least until Backlash, which adds yet another month for him before he can finally get some surgery done; and that doesn't seem like a good idea.
Punk has been really great lately, so he might have a chance too in sort of an upset win, but I think Jericho vs Edge has the more main event feel to it than Punk going against Edge (or another challenger, if Edge goes after the RAW belt). Personally, I'd also love to see Morrison win, but I don't think it's his time yet, especially with so many big names (esp. Taker) involved. A feud between him and Punk that could somehow be set up in the EC seems pretty interesting as well, so that could be the one that both Punk and Morrison can use to shine, and show that they're ready for a permanent Main Event status.
Also, an Edge vs Punk feud (in case he wins at WM) or a Jericho vs Morrison feud for the title (if Jericho wins) would be a great way to elevate both Punk and Morrison respectively (esp. Morrison), following WM and Backlash once their programs for/after WM are finished. I can see Morrison defeating Jericho for the title, but I can't see him defeating Taker. A victory over the Undertaker is usually reserved to well established top tier stars (if they are faces, clean - if they are heels, it's easier as interferences can help), so I don't think Morrison will go over Undertaker as he is a face, but nowhere near "face enough" to win sympathy by beating the Undertaker. All that would do would move him more into a heel position as people just don't like seeing the Undertaker get beat (except by HBK, maybe hehe).
But well, I'm curious as to whether WWE will indeed pull a swerve and have one of the underdogs win (Morrison, Truth (which is really unlikely to me, as R-Truth as well has too little name value yet to headline WM) or Mysterio; though Mysterio might have an outside chance - but only if Batista isn't involved in the Hart/McMahon feud, since Batista vs Mysterio with Mysterio as the champ going into WM could also have worked), but my pick would have to be Jericho, as I personally want to see Jericho vs Edge at WM, and it's also quite good if you have someone like Jericho or Edge as champion, who is considered to be "very good, but beatable" as opposed to Taker, for as much as I love him - he only gets beat by huge monsters like Batista or John Cena, or by top heels if they cheat somehow, and rarely loses to anyone else. And as said, I feel that ensuing Jericho/Morrison or Punk/Edge feuds for the title, depending on who has it after WM, could really be very interesting and do a lot to help the younger guys get to the top tier.
And besides, Jericho is overdue for the Main Event spotlight anyway, considering the good work he's done in the IC and Tag Team scene in recent history, giving back some credibility to both titles.
, maybe later in his career but right now I just see him as a dancing fool.
